Questions tagged [hobbyist]

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4answers
132 views

Safety: Can I harm myself using an AC, 9V 500mA power supply for experiments?

I'm about to embark on my first electronics project and would like to check off a safety question: I want to build a bicycle hub dynamo -> USB charger based on these instructions. It is basically a ...
0
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2answers
112 views

Why is this circuit causing my breaker to trip?

I'm an electronics hobbyist and I decided to make my own electric heater/kiln thingy. It works fine for a couple of minutes, but then the breaker trips. This is my first project involving AC, so I'm a ...
0
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4answers
141 views

Adjustable Power Supply with LM317

I want to create an adjustable power supply for my electronics projects, and the cheapest/fastest option seems to be using an LM317. However, I do not want to blow things up by doing something wrong (...
1
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4answers
69 views

What to look for when buying a reliable hobbyist soldering iron

I wanted to buy a soldering iron for some hobby tinkering, ordered one long ago from Wish! For a few quid, but as you must imagine it's awful. Doesn't heat uniformly, overheats and melts plastic. Tips ...
0
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2answers
272 views

Phone on a breadbord

My current electronics project is to build a very simple customizable "phone". It is my own idea, with as ultimate goal to learn about microcontrollers and basic electronics. This is my set-up so far ...
2
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0answers
61 views

Hobby Project - Signal Frequency detector

Context: I have taken on a little side hobby project to learn by making a circuit which should be able to only go high when it sense an acoustic signal with a frequency around 40kHz. To do this I will ...
2
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2answers
367 views

Bandpass Filter: Single supply op amp design

I have taken on a hobby project and I am trying to make a circuit which would be able to identify an acoustic signal with a frequency of 40kHz. Here is the circuit of a band pass filter for this: ...
0
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1answer
97 views

Should I spread the pads out on the footprint of a THT LED?

I have a 4 pin RGB LED with a common anode. I'm trying to make my first PCB and I am creating the footprint for the LED now. I don't have a datasheet for the LEDs unfortunately. I have a ruler ...
0
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2answers
190 views

Do I need decoupling capacitors when I'm PWMing an LED?

I'm a hobbyist (well, less than a hobbyist really) trying to layout my first PCB design. I'm somewhat familiar with the concept of decoupling capacitors. I'm fading 3 LEDs in and out (really, it's ...
0
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1answer
51 views

using 7.62mm screw terminals on prototype board

What have people done to be able to use 7.62mm screw terminals on prototype boards? I am trying to prototype something use screw terminals that have 7.62mm posts, but the prototype boards do not have ...
3
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3answers
354 views

Simple, low precision, milliohmmeter

Would like to have a simple milliohmeter for car wiring checking. Precision is not important, it's not about 3 vs 4 mΩ, it's about 3 vs 30 vs 300 mΩ. Simple idea is a 1A floating current source (2 ...
0
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2answers
1k views

Replicate PCB design on stripboard

I'm thinking about making a DIY project (this one). I'm a complete n00b, I just have some theoretical knowledge about electronics from some university courses, and I'd like to learn some more. I was ...
1
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3answers
180 views

Could one actually build electronics without EE degree? [closed]

I understand that a teach yourself electronics book can "teach you electronics", but just how far can that take you developmentally? I want to have the ability to solve a problem requiring the ...
7
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7answers
2k views

Is it cheating if I use an SRAM chip as a register file? [closed]

I'm currently building my very own processor using discrete logic (74LSxx series and that) using my very own instruction set architecture. I am starting to rack up a bit of a bill because all the ...
1
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3answers
2k views

Power connectors: 2.1mm and 2.5mm, 1.35 and 1.7mm

I refer to DC power connectors used for a wide variety of common consumer devices. I notice that I have to specify between 2.1mm and 2.5mm when I want to purchase these online. Are the two ...
-2
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1answer
67 views

Cupboard lighting problem

I have some battery powered LED lights to go in a cupboard; and I have a 5-terminal magnetic alarm sensor to turn them on when the cupboard door opens. The problem is that the lights turn on when the ...
0
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2answers
3k views

Calculating current in a series circuit

Given the following circuit, it seems like we could use ohms law to conclude that current = voltage / resistance. With a source voltage of 3.3 and a resistance value of 220, current = 3.3 / 220 = .015 ...
1
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1answer
90 views

Understanding LED specifications (hobby kit)

I have an LED that looks like: It did not come with specs for the LED. In laymens terms, I'm trying to determine the technical term for the following descriptions. (What is the max amount of current ...
0
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3answers
509 views

Digital Rotary Encoder — Broken? Or am I misunderstanding how it works?

I apologize if this seems like a fundamental question, but I feel like I'm missing a fundamental understanding about digital rotary encoders, because none of my basic encoders are working as expected. ...
3
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5answers
3k views

What is a good alternative for the UA741 opamp in hobby projects?

Related to What's the uA741's appeal?, a lot of schematics use this rather dated opamp. My follow-up question would be: What is a good alternative? Of course if you have specific requirements ...
-2
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1answer
99 views

A good way to get into Electronics with just 2 hours per week? [closed]

I want to get into electronics but I only have 2 hours per week to spend time-wise and my budget is low. What are some good projects? Perhaps I should spend my time doing C programming challenges ...
1
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1answer
191 views

Tapping into a 4 AWG wire

I am part of a hobby project where we have a pair of fat, insulated #4 AWG stranded copper wires carrying +5V and ground. I want to tap into these wires every few inches to draw power off it (max draw ...
0
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2answers
322 views

Weak and Cheap Linear Actuator? [closed]

I have a tiny tube that sprays lubricant but I need it to move between some holes in a line. The total distance is only 10 inches. So imagine the holes like this: ...
0
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1answer
75 views

Control a knob on a Honeywell fan via ESP8266

Hey all I am wondering what all I would need in order to control this knob on my Honeywell 2-in 1 Air Circulator Fan, HT-9700 I am wanting to use a ESP8266 in order to control it via wifi. I know ...
1
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0answers
89 views

Low voltage LED bulb or jump into line voltage?

I'm not even sure if this is appropriate StackExchanage community for this but I wasn't sure where else this sort of question would fit. So I tinker with electronics here and there and primarily it ...
1
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1answer
47 views

Buying Low Volume Populated PCBs and Handling Passive PNs

New to Eagle PCB design. I plan on making a custom Beaglebone Black Wireless PCB, and so have pulled down the Eagle files. I'm a student and have a student license. This project will be too difficult ...
2
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1answer
1k views

Do I need to add smoothing capacitor for this setup

I'm trying to build an array (100) of WS2812B which are controlled over an Particle Photon, both are powered by a 10A/5V power supply. Powerwise: 10 WS2812B will be daisy-chained in one row Datawise:...
1
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2answers
195 views

How do you drill a homemade double sided pcb

I have a PCB that I am prototyping at home and it is double sided.... When I drill on one face the other face peels up a little. Does any one know how to avoid this problem?
6
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4answers
2k views

What is so special in the power MOSFETS IRFD120 and IRFD110?

I was trying out a hobby project and I was using the IRFD120 and IRFD110 power MOSFETs to control a motor. The transistors worked pretty fine and we simply ran out of them. When I went to buy some ...
2
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2answers
740 views

Is it safe to over-volt brushless out-runner dc motor on low load conditions?

I have a 1100KV brushless DC motor (turnigy d3548/4) rated maximum voltage 19V i want to run it at 25V assuming low load as i mostly need the higher rpm ! whats are the effects of this higher ...
0
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1answer
130 views

How to wire the mains to a transformer for end user safety?

Because this can be deadly, and is best left to someone qualified; advice for hobbyist projects on the web are reluctant to offer advice on safely handling mains connections. The get-around is to ...
1
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2answers
75 views

What is the term for a photo sensor that takes low-resolution, black-and white, closeup images?

For work I used to have to read and log 7-segment LCD numbers off this tiny (3cm x 1cm) screen tens of times per day. Now I have a webcam setup that reads it for me and does some OCR to automatically ...
0
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1answer
62 views

Solar powered 5W DC12V pump

I'm trying to power a little pump (http://www.amazon.com/gp/product/B00JWJIC0K) with a solar panel I have. I've stepped the voltage out of the panel down to 12V with a buck converter. The panel is ...
0
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1answer
197 views

Is this a limit switch design? What switches needed for this project?

I wish comments on how to best achieve a design involving two limit switches on a DC motor, but which does not reverse the motor. I've researched this design already on this forum; here's my work, I ...
17
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4answers
3k views

What well-known ICs have essentially no packaging?

As a kid I once found a calculator whose IC was protected only by a loose plastic cover. With the cover removed, and with appropriate lighting, I could make out distinct features of the IC– including ...
0
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1answer
329 views

Current Source version of TLC5940 (current sink LED PWM driver)?

Is there a current-source equivalent of a TLC5940 (current-sink) PWM LED driver? I'm working with a large number of linear resonant actuators (LRAs), each of which only uses ~50mA, but must be driven ...
5
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6answers
2k views

Would it be possible to make a solid state transistor by hand?

I am curious, would it be possible to fabricate a modern BJT/FET transistor with hobby/garage tools only if size and aesthetics was not important? Which materials would one use and how would one ...
0
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2answers
293 views

Checking my understanding of how hobby servo motors operate?

Can someone tell me if my understanding is correct please. The control signal to a hobby servo motor that is connected to an arduino operates by : In every 1 s there are fifty windows each of length ...
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1answer
82 views

how can i using CPU8085 and PIO8155 crate an alarm circuit and program [closed]

example ; we have smoke sensor, speaker and my circuit.When Sensor has been active, speaker to sing it. i'm newbie in this topic. how can i do it like this circuit ?
2
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4answers
2k views

Mounting a PCB with velcro

I need a lo-fi way of mounting a PCB (Tessel plus RFID card) under a table. The easiest method by far would be velcro but I'm worried about static discharge frying my circuitry. Should I be?
2
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3answers
2k views

Is electronics an expensive hobby? [closed]

I recently just finished my Eagle schematic for a simple robot that moves and plan to order the parts and the PCB soon. Unfortunately with the soldering iron, helping hands, lights, solder, parts, and ...
2
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2answers
565 views

3 LEDs / 1 POT - fade each LED in turn as POT is changed in value ?

I'm looking for a simple (hopefully !) circuit which would allow a variable resistor to control the brightness of three different coloured LED's. As the variable resesistance is changed in value first ...
4
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4answers
712 views

Is there any way to use industrial sized IC's package in home project?

All actuals DSP or MCUs comes in BGA-like packages with numerous pins and very small size that make them hard to integrate in home project. Does anyone has knowledge of revolutionary breadboards, ...
0
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2answers
94 views

Help with wiring of stereo jack

Could someone point me in the right direction. What I'm doing here is I took the insides from a cheap Bluetooth speaker and I would like to rewire it to an headphone jack (male). I have the cable ...
2
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3answers
4k views

Powering 28 LEDs in series by 220VAC - simple stabilizer

I have a home-made thingy that I would like to use as a lightning in my living room. It contains 7*4=28 LEDs (red, 1.86V, ...
1
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5answers
471 views

How to cheaply switch between two sets of 7-input-wires?

I am trying to make a water level sensor. I want to use a single circuit for two water tanks. For this I need to be able to switch between two sets of 7-wire-inputs to the circuit (the 7 wires that ...
1
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2answers
2k views

How can I create a theatrical spark ejector?

I'm involved with an amateur theatre company (I do lighting, audio etc...) and would like to simulate a switch short-circuiting. I have also done a bit of magic in my time and have used "spark ...
30
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4answers
25k views

Building a hobbyist oscilloscope

I have a project that I've been thinking about for a little while, and I've come to the realization that at some point during its development, I'm going to need an oscilloscope. Okay, not a problem. ...
2
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2answers
2k views

Using an Arduino to Emulate a CD4021 Shift Register for Controlling an NES [duplicate]

This is probably a silly thing to do when I could wait for my CD4021s (74HC165Ns) to arrive and save myself the hassle but I feel as though this can be done and I'm simply missing something. I've ...
0
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1answer
240 views

Should I use Mathematica to understand circuit behavior? [closed]

I've just started learning about circuits from the "Foundations of Analog and Digital Electronic Circuits" book. KCL, KVL, element laws and linear circuits were easy to grasp but then I got the half-...